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OALib Journal期刊

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Neutron Pairing Energy of Finite Nuclei  [PDF]
Masinde Wekesa Fred
Open Access Library Journal (OALib Journal) , 2019, DOI: 10.4236/oalib.1105669
Abstract:
Neutron pairing energies of some of the finite nuclei have been calculated to understand how the neutron pairing changes as the neutron and proton numbers change from odd to even values in isotopes. How its value changes for even (N) - even (Z), even (N) - odd (Z), odd (N) - even (Z) and odd (N) - odd (Z) nuclei has been brought out. The values of pairing energies have been calculated for light nuclei (20 ≤ A ≤ 55), medium nuclei (100 ≤ A ≤ 140) and heavy nuclei (190 ≤ A ≤ 238) and found to lie between: -16 ≤ Pn ≤ 14 MeV, -6 ≤ Pn ≤ 6 MeV and -5 ≤ Pn ≤ 5 MeV respectively. Positive pairing energies only occurred in odd (N) - even (Z) nuclei and this indicated the most stable isotopic nuclei.
Role of Holes in Determining Resistivity and Hall Effect in Crystals of YB2Cu3O7-δ and Bi2Sr2CaCu2O8-δ  [PDF]
Fred Wekesa Masinde
Open Access Library Journal (OALib Journal) , 2019, DOI: 10.4236/oalib.1105663
Abstract:
Electrical transport properties of superconducting materials are a widely studied area in superconductivity. In this study, the role of holes in determination of resistivity, Hall coefficient and Hall angle has been explored using a two-band model due to co-existence of holes and electrons in high-Tc YB2Cu3O7-δ and Bi2Sr2CaCu2O8-δ. The results obtained from this study show that hole resistivity decreases with increase in the ratio while the Hall coefficient is non-linearly dependent on the hole resistivity. An increase in the hole scattering rate causes a drop in the Hall scattering angle.
A Radiological Survey in Tailings: A Case Study of Rosterman Gold Mine, Western Kenya  [PDF]
Conrad Khisa Wanyama, John Wanjala Makokha, Fred Wekesa Masinde
Open Access Library Journal (OALib Journal) , 2020, DOI: 10.4236/oalib.1106293
Abstract: Thirty samples of tailing waste weighing 200 g were randomly collected from both active and inactive tunnels at the Rosterman gold mine site in western Kenya. The average activity concentration of the radionuclides (40K, 232Th and 238U) analyzed by the gamma-ray spectrometry in the tailing samples was 260 ± 14.29 Bq/Kg for 40K, 118 ± 8.25 Bq/Kg for 232Th and 81 ± 3.63 Bq/Kg for 238U. The corresponding radiological parameters for all the collected thirty tailing waste samples were determined from the specific mean activity concentrations. The average dose rate for all the samples was 54 nGy/h. The average radium equivalent value was 262 ± 12.04 Bq/Kg with a range of 154 ± 6.42 Bq/Kg to 350 ± 10.24 Bq/Kg. The average values of external and internal indices were 0.6 ± 0.03 mSv/y and 0.7 ± 0.04 mSv/y respectively. The average indoor and outdoor annual effective dose rates that were determined for this study were 0.3 ± 0.02 and 0.2 ± 0.01 respectively. Therefore, the tailing samples recorded doses and radiological indices below the world average permissible values. This implies that the radiation exposure to the miners and general public due to tailing wastes at Rosterman gold mine poses no significant health risk.
Determining the Radius of the Magnetic Vortex Core of YBCO123 and Bi2212  [PDF]
A. Mukubwa, Fred Masinde
Open Access Library Journal (OALib Journal) , 2019, DOI: 10.4236/oalib.1105661
Abstract:
A plasma has been defined as a quasi-neutral gas of charged particles showing collective behaviour. Plasmas can support waves depending on the local condi-tions, the presence of external electric and magnetic fields. A characteristic property of plasmas is their ability to transfer momentum and energy via col-lective motion. An example in this case, is the Langmuir waves where plasma electrons oscillate against a stationary ion background. In a superconductor, two plasma electrons arise one that is made up of normal electrons and the other that is made up of super-electrons. In this study, we consider a system of super-electrons forming a super-particle. The motion of the plasma su-per-particles around a magnetic vortex core has been studied in the YBCO123 and Bi2212 systems.
Ethnicity, Governance and Prevention of Conflict: State of the Issue and Research Perspectives
Eric Masinde Aseka
Africa Development , 1999,
Abstract: The paper presents the issues of ethnicity, governance, and prevention of conflicts in terms of their political management through the proper exercise of power. Conflict cannot be prevented. It can only be managed. The crucial determining factor is ethnic, gender and class relations in power. The paper traces notion of power in the works of various philosophers and outlines the significance of perceiving the impact of paradigmatic shifts on political discourse. These shifts are perceived as intellectual itineraries from structural-functionalism to the contemporary North America Critical Theory and postmodernist theory. The problematic of ethnicity is posed within debates emanating from the ensuing perspectival contests and paradigmatic struggles. The moral economy, rational choice, and subaltern approaches are also interrogated and critiqued. The paper contends that when the structures and procedures of democratic governance are undermined, political legitimacy also gets compromised. Africa Development 1999, Vol. XXIV, Nos 3 & 4, 71-102
Violation of Linguistic and Patient’s Rights in Kenya
Nyongesa Ben Wekesa
Journal of Language, Technology & Entrepreneurship in Africa , 2012,
Abstract: Health communication, particularly patients’ rights, has become an issue of concern in the recent past. This paper exposes the patients’ rights violation on two main planes: the linguistic plane and the right to information plane. The paper also assesses the world trend on the aforementioned violations and finally contextualises the patient-physicians relationship models. The paper makes the following observations: there is need to reinforce the law on package inserts, especially, the inserts for the patients in both content and language. The PPIs should be translated into Kiswahili for ease readability and access to information. There is also need to enlighten the public and patients in particular on the patients’ rights and enact and implement the Freedom of Information for the public to hold the state responsible for accountability and quality service including health services.
Economic Injustice as an Understanding of the Existence of Two Americas—Wealth and Poverty  [PDF]
Fred Bedell
Open Journal of Political Science (OJPS) , 2014, DOI: 10.4236/ojps.2014.43011
Abstract:
This essay speaks to government policies, the practices of the corporate sector, the inherited wealth of the few, and the consumptive behavior of the masses as the underlying causes of economic injustice. This is perceived as leading the country to an oligarchy.
Synthesis and characterization of whisker-shaped MnO2 nanostructure at room temperature
Deogratius Jaganyi,Mohammad Altaf,Isaac Wekesa
Applied Nanoscience , 2013, DOI: 10.1007/s13204-012-0135-3
Abstract: Manganese dioxide nanoparticles have been synthesized, via a facile one-step solution phase approach, by the reduction of potassium permanganate with sodium thiosulphate at room temperature. Upon addition of thiosulphate to the solution of permanganate, a transparent dark-brown color species appeared which was stable for several months. The obtained MnO2 solution was characterized by means of UV–vis spectra, Transmission electron microscopy (TEM), and Fourier transforms infrared spectroscopy. Fourier transforms infrared spectroscopy spectra of pure MnO2 show the occurrence of O–Mn–O vibrational mode at around 600 and 475 cm 1. The chemical composition was obtained by EDX analysis and confirmed the presence of Mn and O in the sample. From the TEM image, the surface morphology of the sample shows uniformly dispersed particles, which are spherical in shape. The selected area electron diffraction patterns revealed that the MnO2 are crystalline in nature.
Modelling Credit Risk for Personal Loans Using Product-Limit Estimator
Okumu Argan Wekesa,Mwalili Samuel,Mwita Peter
International Journal of Financial Research , 2012, DOI: 10.5430/ijfr.v3n1p22
Abstract: A product- limit approach was adopted to estimate time to default for male and female loan applicants. For each group, a sample of 250 applicants was observed for a 30 months. The life of the account is measured from the month it was opened until the account becomes ‘bad’ or it is closed or until the end of observation. The account is considered bad if payment is not made for two consecutive months in line with the industry practice. If the account does not miss two payments and is closed or survives beyond the observation period, it is considered to be censored. The results showed that there is no significant difference between male and female applicants in terms of their survival times and hazard rates.
Effects of Forest Disturbance on Vegetation Structure and Above-Ground Carbon in Three Isolated Forest Patches of Taita Hills  [PDF]
Chemuku Wekesa, Nereoh Leley, Elias Maranga, Bernard Kirui, Gabriel Muturi, Musingo Mbuvi, Ben Chikamai
Open Journal of Forestry (OJF) , 2016, DOI: 10.4236/ojf.2016.62013
Abstract: The structure and species composition of undisturbed natural forests serve as benchmarks for understanding forest carbon storage potential for reduced carbon emissions. Even though Kenya is seeking to stabilize forest cover, reverse degradation and increase forest cover through mechanisms such as REDD+, there is relatively little information on inherent forest carbon storage potential or its response to disturbance. Comparative studies were undertaken in three remnant fragments of indigenous forests in Taita Hills, Kenya to characterize the structure and forest carbon storage potential of undisturbed, moderately and heavily disturbed sites within these forests. The sensitivity of forest carbon storage estimates to different methods of tree biomass estimation were also examined, including estimates which used DBH, tree height and wood density from extracted tree cores. Disturbance altered the forest structure, reduced species diversity and decreased the capacity of the forests to sequester carbon. The forests’ capacity to sequester carbon reduced by between 9.2% and 70.7% depending on the site (forest fragment) and level of disturbance. Models with DBH and wood density gave higher quantities of carbon of between 0.9% and 44.4% for sites exhibiting different levels of disturbance. The present results suggest that disturbance had strong influence on forest structure, species diversity and carbon stocks and therefore maintaining the forests’ ecological integrity over the long-term may prove difficult if the frequency and intensity of disturbance increases. Moreover, development and implementation of effective mitigation strategies to reduce carbon emissions will require the use of local biomass models since they are accurate.
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